Compare commercial mortgages and bridging loans — speed, cost, property condition requirements, term, and the right tool for each scenario.
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Check EligibilityA commercial mortgage is a long-term secured loan used to purchase or refinance commercial property — offices, retail units, industrial premises, mixed-use buildings, and development land. As with a residential mortgage, the lender takes a first legal charge over the property and advances capital that is repaid over an agreed term, typically five to twenty-five years, through monthly payments of capital and interest (or interest-only in some structures).
The affordability assessment for a commercial mortgage differs from residential. For investment properties, lenders focus on the rental income generated by the property relative to the loan repayments — typically requiring rental cover of 125-135% of the interest payment. For owner-occupied premises, lenders assess the trading business’s ability to service the debt from operating profit. This rigour takes time: valuations, tenancy schedules, business accounts, and solicitor involvement mean the fastest commercial mortgages take four to six weeks, and complex cases can run to three months.
The reward for that patience is a substantially lower rate. Commercial mortgages in the current UK market typically run at 5-8% per year — compared to 0.55-1.5% per month for a bridging loan. Over a five to twenty-five year hold, that differential is the difference between a profitable investment and a costly one. For investors with a clear long-term strategy and properties in good condition, the commercial mortgage is almost always the lowest-cost form of commercial property finance available.
A bridging loan secured against commercial property operates on the same principles as its residential counterpart: short-term, fast, flexible, and based primarily on the value of the asset and the credibility of the exit strategy rather than income or affordability. The key difference from the commercial mortgage is that the bridging lender will lend on properties that a commercial mortgage lender will not touch — vacant units, properties without tenants, premises in poor structural condition, and buildings without a valid EPC.
This flexibility is critical for a significant proportion of commercial property transactions. Auctions, off-market deals, and distressed asset acquisitions often involve properties that cannot be immediately mortgaged. A commercial unit with a sitting void, a retail premise needing significant refurbishment, or a mixed-use building with planning complications will all be declined by conventional mortgage lenders. A bridging lender evaluates the asset’s current value and the investor’s plan to stabilise and exit — typically by securing a tenant and refinancing to a commercial mortgage.
The trade-off is cost. At 0.75-1% per month on a commercial bridging loan, the annualised rate runs to 9-12% before fees — roughly twice the cost of a commercial mortgage. This premium is the price of speed and unconditional flexibility on property condition.
Scenario: Buying a vacant retail unit for £350,000 at auction
Bridging loan at 70% LTV: £245,000 borrowed at 0.85% per month, for 12 months while a tenant is found and a commercial mortgage arranged. Monthly interest: £2,083. Total interest over 12 months: £24,990. Arrangement fee at 1.5%: £3,675. Legal and valuation costs: approximately £3,500. Total bridging cost: approximately £32,165.
Once a tenant is secured on a 10-year lease at £28,000 per year, the commercial mortgage at 6% on £245,000 costs £14,700 per year in interest — less than half the annualised bridging cost. The bridge was necessary to acquire the asset; the mortgage is the correct long-term vehicle once the income is established.
Scenario: Refinancing a fully tenanted office block with no time pressure
Commercial mortgage at 6% on a £500,000 loan over 15 years (interest-only): £30,000 per year (£2,500 per month). Total interest over 15 years: £450,000. A bridging loan for the same amount at 0.85% per month would cost £4,250 per month — nearly double — making it entirely unsuitable as a long-term hold vehicle.
You’re buying a tenanted office building from a vendor who can wait eight weeks. A commercial mortgage is unambiguously the right choice. The property generates rental income that satisfies the affordability test, you have time for the process, and the rate saving over your hold period will be substantial.
You’ve spotted a vacant pub at auction with a guide price of £180,000 that you plan to convert to a restaurant. A bridging loan is the only viable option. The property is vacant, the auction requires completion within 28 days, and the commercial mortgage lender’s affordability assessment requires a trading tenant or established business income. Buy on a bridge, complete the conversion, find a tenant, then refinance.
You own a commercial property on a short-term bridging loan that’s been running for nine months, but the refinance is taking longer than expected. Talk to your bridging lender about a term extension — most will extend for a fee — and simultaneously push your mortgage broker hard on the commercial mortgage timeline. The cost of a bridging loan running beyond 12-18 months becomes very expensive relative to a commercial mortgage.
You want to buy a mixed-use building (ground-floor retail, two flats above) for investment. Both products might apply, but commercial mortgage lenders are generally comfortable with mixed-use properties that have established tenancies. If the building is fully let and generating income, a commercial mortgage is likely accessible and appropriate.
Commercial mortgages and bridging loans serve the same underlying need — financing commercial property — but at completely different timescales and for properties in different states of readiness. The commercial mortgage is the long-term, low-cost, steady-state vehicle. The bridging loan is the short-term, high-cost, unconditionally flexible tool for situations where the commercial mortgage is unavailable.
The most commercially astute investors understand that the two products are often used in sequence, not as alternatives. Bridge to acquire and stabilise; mortgage for the long-term hold. The bridging cost is an investment in securing an asset that a commercial mortgage alone could never have funded.
| Feature | Commercial Mortgage | Bridging Loan |
|---|---|---|
| Speed | 4-12 weeks | 3-14 days |
| Interest rate | 5-8% per year | 0.55-1.5% per month |
| Typical term | 5-25 years | 1-18 months |
| Max LTV | 65-75% for investment; 70-80% for owner-occupied | 65-75% of current value |
| Property condition | Must be lettable or operational | Any condition including vacant and derelict |
| Repayment | Monthly capital and interest or interest-only | Rolled-up or serviced — lump sum at end |
| Fees | £1,000-2,500 arrangement + valuation | 1-2% arrangement fee |
| Best for | Long-term commercial property hold at lowest rate | Fast acquisition or properties needing work before mortgaging |
Rule of thumb: use a commercial mortgage if the property is tenanted, lettable, and you can wait — the rate differential over 5+ years is enormous. Use a bridging loan when you cannot wait, or when the property would not pass a mortgage lender's condition or letting requirements. Most successful investors use a bridging loan to acquire and stabilise, then refinance to a commercial mortgage once income is established.
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